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The present study investigated how individual- and group-level psychological need satisfaction (Deci & Ryan, 1985a) influence affect, intrinsic motivation, and performance satisfaction. It also examined the impact of leader personality on group need satisfaction. Groups (45) of 4 college women participated in a task, with 1 member designated “leader.” Multilevel modeling revealed significant between- and within- groups relations. Individuals in groups with higher need satisfaction reported greater pleasant affect, intrinsic motivation, and satisfaction with group performance. In addition, individuals whose need satisfaction was higher than their group's average reported greater intrinsic motivation, pleasant affect, and performance satisfaction. Group need satisfaction was found to be lower under neurotic leaders and higher under agreeable, introverted leaders. Implications for group environments are discussed.